I know this has become a cliche, but I would like to post it just as a sobering reminder to myself and to everyone. Note that the prayer is much longer than what is usually quoted. And a hat tip to the anonymous ecumenical working groups who placed this in the Week of Prayer for Christian Unity resources list.
God grant me the serenity to accept the things I cannot change; courage to change the things I can; and wisdom to know the difference.
Living one day at a time; enjoying one moment at a time; accepting hardships as the pathway to peace; taking, as he did, this sinful world as it is, not as I would have it; trusting that he will make all things right if I surrender to his will; that I may be reasonably happy in this life and supremely happy with him forever in the next. Amen.